Normalize fullwidth punctuation to ASCII across codebase.

Add scripts/normalize_ambiguous_unicode.py; fix corrupted patch_instance_theme_templates.py. Preserves curly quotes in string literals; removes Git homoglyph warnings on .env.example.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/strategy/templates/symbol_live_price_snippet.html

@@ -1,10 +1,10 @@
-{# 币种输入旁实时现价（须加载 symbol_live_price.js） #}
-{% macro symbol_live_price_hint(price_id, symbol_input_id, direction_input_id='') -%}
-<span
-    id="{{ price_id }}"
-    class="symbol-live-price"
-    data-symbol-input="{{ symbol_input_id }}"
-    {% if direction_input_id %}data-direction-input="{{ direction_input_id }}"{% endif %}
-    aria-live="polite"
->现价：—</span>
-{%- endmacro %}
+{# 币种输入旁实时现价(须加载 symbol_live_price.js) #}
+{% macro symbol_live_price_hint(price_id, symbol_input_id, direction_input_id='') -%}
+<span
+    id="{{ price_id }}"
+    class="symbol-live-price"
+    data-symbol-input="{{ symbol_input_id }}"
+    {% if direction_input_id %}data-direction-input="{{ direction_input_id }}"{% endif %}
+    aria-live="polite"
+>现价:—</span>
+{%- endmacro %}